9 Visualization
Maschinenfabrik Reinhausen GmbH 2020
154
4453918/14 EN
ETOS
®
TD
change command
is issued after expiration of the set delay time T1. The
on-load tap-changer carries out a tap-change in a raise or lower direction to
return to the tolerance bandwidth.
Figure 108: Behavior of the control function with delay time T1
1 Upper limit of bandwidth
4 Set delay time T1
2 Desired value
5 Control variable measured value
3 Lower limit of bandwidth
6 Bandwidth range
A Control variable is outside of the
bandwidth. Delay time T1 starts.
B Control variable returned to within
the bandwidth before delay time
T1 has expired.
C Control variable is outside of the
bandwidth. Delay time T1 starts.
D Control variable is still outside the
bandwidth after delay time T1 has
expired. Tap-change operation is
initiated.
Time response T1
You can use this parameter to set the time response for delay time T1. You
can select the following options:
▪ Linear time response
▪ Integral time response
Linear time response
With linear time response, the device responds with a constant delay time
regardless of the control deviation.
Integral time response
With integral time response, the device responds with a variable delay time
depending on the control deviation. The greater the control deviation (ΔU) in
relation to the set bandwidth (B), the shorter the delay time. This means that
Summary of Contents for ETOS TD
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